28 July 2014 Development of the hard x-ray monitor onboard WF-MAXI
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Abstract
WF-MAXI is a mission to detect and localize X-ray transients with short-term variability as gravitational-wave (GW) candidates including gamma-ray bursts, supernovae etc. We are planning on starting observations by WF-MAXI to be ready for the initial operation of the next generation GW telescopes (e.g., KAGRA, Advanced LIGO etc.). WF-MAXI consists of two main instruments, Soft X-ray Large Solid Angle Camera (SLC) and Hard X-ray Monitor (HXM) which totally cover 0.7 keV to 1 MeV band. HXM is a multi-channel array of crystal scintillators coupled with APDs observing photons in the hard X-ray band with an effective area of above 100 cm2. We have developed an analog application specific integrated circuit (ASIC) dedicated for the readout of 32-channel APDs' signals using 0.35 μm CMOS technology based on Open IP project and an analog amplifier was designed to achieve a low-noise readout. The developed ASIC showed a low-noise performance of 2080 e- + 2.3 e-/pF at root mean square and with a reverse-type APD coupled to a Ce:GAGG crystal a good FWHM energy resolution of 6.9% for 662 keV -rays.
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Makoto Arimoto, Makoto Arimoto, Yoichi Yatsu, Yoichi Yatsu, Nobuyuki Kawai, Nobuyuki Kawai, Hirokazu Ikeda, Hirokazu Ikeda, Atsushi Harayama, Atsushi Harayama, Shin'ichiro Takeda, Shin'ichiro Takeda, Tadayuki Takahashi, Tadayuki Takahashi, Hiroshi Tomida, Hiroshi Tomida, Shiro Ueno, Shiro Ueno, Masashi Kimura, Masashi Kimura, Tatehiro Mihara, Tatehiro Mihara, Motoko Serino, Motoko Serino, Hiroshi Tsunemi, Hiroshi Tsunemi, Atsumasa Yoshida, Atsumasa Yoshida, Takanori Sakamoto, Takanori Sakamoto, Tadayoshi Kohmura, Tadayoshi Kohmura, Hitoshi Negoro, Hitoshi Negoro, Yoshihiro Ueda, Yoshihiro Ueda, } "Development of the hard x-ray monitor onboard WF-MAXI", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445Z (28 July 2014); doi: 10.1117/12.2054942; https://doi.org/10.1117/12.2054942
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